Fix a missing include from r88876.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@88879 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclarationName.cpp b/lib/AST/DeclarationName.cpp
index d003594..1ff068c 100644
--- a/lib/AST/DeclarationName.cpp
+++ b/lib/AST/DeclarationName.cpp
@@ -18,6 +18,7 @@
 #include "clang/Basic/IdentifierTable.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/FoldingSet.h"
+#include <cstdio>
 using namespace clang;
 
 namespace clang {